CVE-2026-63937Patch

LOWCVSS 8.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Use READ_ONCE() when reading entries/indices from PSC buffer Use READ_ONCE() when reading entries/indices from the guest-accessible Page State Change buffer to defend against TOCTOU bugs. Don't bother with READ_ONCE()/WRITE_ONCE() for cases where KVM is writing (and not consuming the result!), as the guest isn't supposed to touch the buffer while it's being processed. I.e. using READ_ONCE() is all about protecting against misbehaving guests.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-367

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Full discourse1 post

DFIR Lab@DFIR_Lab91d
Patch
#ALERT CVE-2026-63937 | CVSS 8.8 HIGH Linux kernel KVM SEV vulnerability enables TOCTOU attacks via Page State Change buffer. Local attacker with low privs can achieve code exec. Patch immediately. #CVE #Vulnerability #PatchNow #ThreatIntel https://t.co/zY5aGMVLUn
Post summary
The tweet alerts to CVE-2026-63937’s high‑severity KVM SEV vulnerability and urges immediate patching, providing technical details about the TOCTOU flaw and local code‑execution potential.
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91 followersView on X

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